Remove duplicate text about Nerd Fonts installation

[softworkz]

No description provided.

[Copilot]

Pull Request Overview

This PR removes a duplicate line of text in the custom prompt setup tutorial documentation. The duplicate line provided redundant information about installing Nerd Fonts for proper glyph display in customized command prompts.

• Removes one instance of the duplicated Nerd Font installation recommendation

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[learn-build-service-prod]

Learn Build status updates of commit 817de8f:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/tutorials/custom-prompt-setup.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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